Most of “the numbers” you might want to save – that is, your monthly Buying Plans – are generated by the Open-to-Buy Calculator, based on the few entries you input (planned sales and margins, etc.)
The best way to "save" those, once you have developed a plan you like, is to just print out a hard copy for reference. Do that by using the “PRINT ALL“ button.
In fact, depending on your computer and/or browser, you may be able to simply email a pdf copy of the plan.
These online Open-to-Buy calculators work "in the browser."
That is, your entries will be retained in the browser you use for input (e.g., Firefox, Chrome, Safari, Edge), subject to your settings for clearing its history.
No more worries if you are interrupted while working with it. When you resume, use the same browser and device, and your plans will be there! (Even if it is a few days later, so long as you have not cleared the history in that browser.)